Constructed from premium JGS-1 quartz, ensuring exceptional U-V and visible light transmittance for accurate measurements. Features a diameter of 50mm and height of 39mm, devised for precise optical applications and experiments. Achieves high surface accuracy of /4 at 632.8nm, making it ideal for optical setups. Maintains a shape tolerance of ±0.1mm and an angle error of ±3', guaranteeing reliable and consistent results. Perfect for use in various U-V visible spectrophotometers, enhancing the performance of your optical instruments.